diff options
Diffstat (limited to 'config')
| -rw-r--r-- | config/is_sorted.m4 | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/config/is_sorted.m4 b/config/is_sorted.m4 new file mode 100644 index 000000000..52b062d7e --- /dev/null +++ b/config/is_sorted.m4 @@ -0,0 +1,20 @@ +# CHECK_FOR_IS_SORTED +# ------------------- +# Look for is_sorted in std:: and __gnu_cxx:: and define +# some things to make it easy to find later. +AC_DEFUN([CHECK_FOR_IS_SORTED], [ +AC_MSG_CHECKING([where we can find is_sorted]) +AC_LANG_PUSH([C++]) +is_sorted_result= +AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <algorithm>], + [std::is_sorted((int*)0L, (int*)0L);])], + [is_sorted_result=std], + [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <ext/algorithm>], + [__gnu_cxx::is_sorted((int*)0L, (int*)0L);])], + [is_sorted_result=__gnu_cxx], + [AC_MSG_FAILURE([cannot find std::is_sorted() or __gnu_cxx::is_sorted()])])]) +AC_LANG_POP([C++]) +AC_MSG_RESULT($is_sorted_result) +if test "$is_sorted_result" = __gnu_cxx; then is_sorted_result=1; else is_sorted_result=0; fi +AC_DEFINE_UNQUOTED([IS_SORTED_IN_GNUCXX_NAMESPACE], $is_sorted_result, [Define to 1 if __gnu_cxx::is_sorted() exists]) +])# CHECK_FOR_IS_SORTED |